#include<iostream>

using namespace std;

int main()
{
    long long ret = 0;
    int n = 202420242024 % 2;
    long long count = 202420242024 / 2;
    if (n == 1)
    {
        ret = 20 * count;
    }
    else
    {
        ret = 24 * count;
    }
    cout << ret;
    return 0;
}